package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper  shoppingCartMapper;

    @Autowired
    private DishMapper  dishMapper;
    @Autowired
    private SetmealMapper  setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());

       List<ShoppingCart> list  = shoppingCartMapper.list(shoppingCart);

       if (list !=null && list.size()>0){
           shoppingCart=list.get(0);
           shoppingCart.setNumber(shoppingCart.getNumber()+1);
           shoppingCartMapper.updateNumberById(shoppingCart);
       }else {
           //如果不存在，就插入一条数据，数量设为1
           //获取当前添加的是菜品还是套餐
           Long dishId = shoppingCartDTO.getDishId();
           if (dishId !=null){
               //添加进来的是菜品
               Dish dish = dishMapper.getById(dishId);
               shoppingCart.setName(dish.getName());
               shoppingCart.setImage(dish.getImage());
               shoppingCart.setAmount(dish.getPrice());

           }else {
               //添加进来的是套餐
               Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
               shoppingCart.setName(setmeal.getName());
               shoppingCart.setImage(setmeal.getImage());
               shoppingCart.setAmount(setmeal.getPrice());

           }
           shoppingCart.setUserId(BaseContext.getCurrentId());
           shoppingCart.setCreateTime(LocalDateTime.now());
           shoppingCart.setNumber(1);
           shoppingCartMapper.insert(shoppingCart);
       }
    }

    /**
     * 展示购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart
                .builder()
                .userId(BaseContext.getCurrentId())
                .build());
    }

    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }


    /**
     * 删除购物车的一个菜品或套餐
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
